Maximum demand register



Feb. 21, 1939. R Q HAMILL' 2,147,895

MAXIMUM DEMAND REGISTER Filed July 2'7, 1955 3 Sheets-Sheet l Feb. 21,1939. R o, HAMILL 2 l47,895

MAXIMUM DEMAND REGISTER Filed July 27, 1935 3 Sheets-Sheet 2 [1? venZorF627 0. HamLZZ Feb. 21, 1939. R. 0 HAMILL 2,147,895

MAXIMUM DEMAND REGISTER Filed July 27, 1935 3 Shets-Sheet 3 F/c-/0. w

BY QMM ATM/{ATTORNEY rnreureu rep. Z1, 1958 UNITED STATES PATENT OFFICEMAXHHUM DEMAND REGISTER poration oi Illino Application July 27, 1935,Serial No. 33,452

10 Claims.

This invention relates to means, applicable to electric meteringapparatus, whereby the maximum demand for electricity through themetering apparatus may be ascertained.

The present invention is an improvement on the apparatus constitutingthe subject matter of my application Serial No. 772,905 filed April 28,1934 issuing into Patent Number 2,063,735.

According to my patent just referred to, means is provided for adding orintegrating the maximum demand for electrical energy through the meterover a period of time to the maximum demand over a succeeding or aseries of" succeeding periods of time. However the apparatus describedin the above patent has certain practical limitations.

It is one of the objects of the'present invention to provide means forovercoming the practical limitations of the above named patent to allsizes or capacities of electric watthour meters.

It is also one of the objects of the invention to provide apparatus ofthe class described whereby the maximum demand for a given period isaccumulatively added to the maximum demand for the preceding period.

A further object of the invention is to provide a maximum demandregister that can readily be made an indicating demand, an accumulativedemand or an integrating demand register with a minimum of changes inthe essential parts.

Another object of the invention is to provide apparatus of the classdescribed in which the load on the watthour meter will be a minimum bygearing down from the watthour meter motor shaft all moving parts, ofthe complete device.

I Other objects and advantages of the invention will be apparent fromthe description that follows.

In the accompanying drawings which illustrate the invention:

Fig. 1 is a front elevation of the mechanism embodying the invention.The top row of dials reads kilowatt hours while the bottom row readskilowatts demand;

Fig. 2 is a bottom plan view of the apparatus of Fig. 1 with the resetarm or maximum demand indicator and gear sector operated therebyomitted;

Fig. 3 is a sectional view of Fig. 2 on line 3-3 on an enlarged scale;

Fig. 4 is a part view of Fig. 1 showing the ratchet which preventsbackward rotation of the lower dials of Fig. 1;

Fig. 5 is a view taken generally along the line 5-5 of Fig.2 and showingthe sector of a gear with the reset weight used to reset the timeinterval mechanism to zero;

Fig. 6 is a view illustrating a modification of the link drivingarrangement shown in Fig. 2 which permits of a gravity reset or a springif desired for the time interval mechanism and yet provides one or morerevolutions of the driven member;

Fig. 7 shows the reset mechanism 'for the device illustrated in Figs. 1and 2 consisting of a reset arm or maximum demand indicator and a sectorof a gear meshing with a pinion fastened to a driven member, whichdriven member remains at its maximum movement for the time period;

Fig. 8 shows the reset arm of Fig. '7 extended as a pointer moving overa scale calibrated in kilowatts demand forming an indicating demandregister, together with kilowatt hour dials and kilowatt demand dials ofan accumulative demand register which is illustrated in detail in Figs.9, 10, and 11;

Fig. 9 is a top plan view from the rear of Fig. 8 showing the drivingmechanism;

Fig. 10 is a view taken along the line ill-i0 of Fig. 9 and shows thedriving gears for the maximum demand pointer of Fig. 8; and

Fig. 11 is a section of the mechanism along the line Il--i l of Fig. 9on an enlarged scale.

Referring to the drawings there is thereon shown a motor mechanismadapted to be used in connection with an alternating current circuit,although the invention may be employed in connection with direct currentcircuits. As is well known, an integrating watthour meter for suchcircuits comprises an alternating current-metermotor driven by theelectric energy to be measured, the shaft of the armature beingconnected by suitable gearing with a series of pointers moving overdials upon which are indicated the watthours to be measured. A part ofthe suitable gearing just mentioned is what is known as a change gearand varies for the various sizes or capacities of watthour meters, as iswell known. A suitable gearing is provided in this invention from themeter motor shaft which drives, the kilowatt demand dials and whichgearing is varied with various sizes of watthour meters in such a mannerthat the kilowatt demand dials will read directly in kilowatts demand.In order to accomplish one or more revolutions of the kilowatt demanddials a novel driving coupling is provided. This arrangement alsopermits of restoring the well known pusher pointer to zero by means ofgravity. A spring however may also be employed.

. shaft or arbor 28.

Referring to Figs. 1 and 2 of the drawings the shaft 9 of the metermotor rotor carries a worm 2 meshing with a worm wheel 8 which is fixedupon the shaft 6 and rotatably mounted in the brackets 5 and 8. Theshaft 5 has two worms, I and 8, cut on it. The worm 1 drives thekilowatt hour change gear, only partly shown here, to the usual kilowatthour dials l8, i'l, I8 and IS with their respective pointers l8, l6, l8and 78 in a well known manner. The kilowatt demand dials 20, 2 i, and 22with their respective pointers 23, 26, and 25 are suitably mounted onshafts which revolve in the plates M25 and 2? and are driven as follows:The worm d which is driven by the meter motor shaft l thru worm 2 andworm gear 8 drives the worm gear 8 which is rigidly mounted on shaft 88and on which is also mounted gear wheel H which meshes with and drivespinion l2. The shaft ill is rotatably mounted in plates l3 and id. Thepinion i2 is a part of a friction driving clutch, its face contactingthe face of the member l5 and against which it is held by the spring 28.The illustration in Fig. 3 however shows the clutch open in order toillustrate the difference in outside diameter of the sleeve on which themember 65 is rotatably mounted. The complete driving clutch consists ofa shaft or arbor 29 which is fixed to the plate I3 by means of the nut88, so that it cannot rotate and which has its other end mounted in asupport Al in the member 85. The shaft or arbor 29 as illustrated inFig. 3 is slightly undercut or of reduced diameter for the greater partof thecentral portion of its length in order to provide a bearingsurface of less friction for the sleeve 85. Rotatably mounted on thefixed shaft or arbor 281s a sleeve 85 which is of different outsidediameters along its length; it is of lesser diameter under the member i5than under the pinion l2, thus providing ashoulder 81 which togetherwith the collar 32, holds the member i5, while rotatable, yet in a fixedrelation longitudinally on the sleeve 85 so that when the pinion I2 ismoved along the sleeve 85, against the spring 28, to open the clutch,the member l5 cannot fol-' low but is left behind insuring a positiveopening of the clutch. A collar 88 pressed on the sleeve 85 carries thetension of the spring 28. This collar can be made an integral part ofthe sleeve 85 if desired. A collar 88 pressed on the shaft or arbor 29together with the collar 32 also pressed on this shaft limits themovement of the sleeve 85, along the shaft and is such that the sleeveis freely and suitably rotatably mounted on the Member l5 consists of afriction driving'face on one end which engages the friction driving faceof pinion I2, forming a friction clutch, and of a pinion 33 on the otherend. In assembling and disassembling'the mechanism, the member [5 isslipped onto and off of the sleeve 85 which is secured againstlongitudinal movement on the shaft or arbor 29. It will be observed thatthe member 15 and the maximum demand indicating mechanism driven therebycan be readily installed or removed by movement thereof longitudinallyrelative to the sleeve 85. A disc 34 having a driving pin 35 mounted init is also mounted fixedly on the pinion end of member i5 by pins 82.The friction driving clutch consisting of members i2 and i5 is openedand closed at intervals by means of a lever 85 pivoted at 38' in a wellknown manner in apparatus of the class described, the operation beingefiected by a cam 38" driven by a clock or synchronous timing motor.Meshing with pinion 33 is a sector 87 of a gear (Fig. 5) carrying a 88.The sector til is suitably mounted on plate it by pin bearing 88 andguide pin 39. The sector 8? is weighted in such a manner that whenthefriction driving clutch formed by the face of the pinion l2 and theadjacent face of the member i5, after having been driven forward by themeter motor shaft i for a predeteed time interval, is opened it willdrop by gravity restoring the disc 34 with pin 35 to its initial or zeroposition.

Member 88 is a stud rigidly mounted in the plate 2? and which stud haspin bearing holes 58 and ill in either end. The shaft or arbor'29 restsin the bearing hole M and the shaft 42 revolves in the bearing hole 58.The stud 35 carries a rotatable sleeve 53 on which sleeve is mounted agear wheel 58; a spring washer 55, a pinion 48 to which is rigidlyfastened a disc 71, all of which are rotatably mounted on the sleeve 53and are held in position and under tension of the spring washer by acollar 95 pressed or pinned on the end of the sleeve 53. Loosely androtatably mounted on stud 8B is a disc 58 with its connecting pin 58engaging the driving pin 85 of the disc 3d. The disc 89 is held inposition by a collar 9! which is fastened on the end of stud 38. A disc85 in addition to the disc 58 can be so mounted as is shown in Fig. 6 soas to permit one or more revolutions of the disc 8G in a practicaloperating manner before rotation of the disc 51 is effected. That is,for each additional disc, like disc 58 or disc I5, substantially onemore revolution of the disc 36 is permitted before rotation of the disc57 is effected than is the case if the additional disc is absent.

The gear wheel 55 meshes with a pinion 59.

which is fastened to the shaft 52. The shaft 52 is rotatably mounted inplates 28 and i4, and it also carries rigidly mounted thereon a ratchetwheel 53, pinion 54 and kilowatt demand dial hand 23. The ratchet wheel53"with pawl 55 and retaining spring 58 is provided to prevent reverserotation of shaft 52 as will be described later. The pawl 55 and spring58 are mounted on plate 21 in a suitable manner. The pinion 54 mesheswith a gear wheel 51 which is rigidly mounted on the shaft 42. The shaft42 is rotatably mounted in plate 28 and bearing hole 48, andcarriesrigidly mounted thereon a pinion 58, and dial hand 24. The pinion 58meshes with a gear wheel 80 which is rigidly mounted on shaft 8 I. Shaft8| is rotatably mounted in plates 28 and 21 and has rigidly mounted onit dial pointer 25.

The plates 28, 21, I4 and 13 which carry all the.

elements of the device are held together by spacer posts 82, 83, 84, 85,88, and 8! in a suitable and well known manner.

As is well known in connection with demand 9 registers a time period,such as a month, is employed after which a reset device is operated toreturn a maximum demand pointer to the zero position in order to beginthe next monthly demand period. This is effected by means of maximumdemand indicator 88 mounted on a suitable shaft 89 which shaft hasrigidly mounted on it a sector 10 of a gear meshing with a. pinion 48 asshown in Fig. '7. The shaft 89 is suitably and rotatably mounted inplates 28 and 21. A zero stop H and a maximum limit stop 12 are providedfor the maximum demand indicator 88. These stops may, if desired, bemade adjustable.

The maximum demand indicator 58 moves in direct proportion to the demandand can with a suitable scale be used to indicate the demand as will bepresently set forth.

Referring now to Fig. 8, this figure, a practical application of whichis shown in Fig 3, shows schematically what is believed to be a novelway of driving one member with another by employing one or moreintermediaries in which one or more revolutions of the driven member iseffected by the driving member yet permitting restoration to its initialposition of the driver without affecting the position of the drivenmember which is left at its maximum position as is required in a deviceof the class described. Assume the position of the various members-ofFig. 6 to be exactly as shown in the figure and to be the zero orstarting position of the driver pinion 33 with disc 34 and driving pin35. The zero position of the pin 35 is fixed by the zero position 33 ofthe gear sector 31, Fig. 5, meshing with the pinion 33, as it is thisweighted gear sector which brings the driver back to the zero orstarting point every time the lever 36 opens the clutch. It is assumedthat 39 can be made adjustable if need be. When pinion 33 rotates, thepin 35 bears against the pin 16 of the disc 15, and in turn the pin"bears against the pin 50 of the disc 43, also in turn the pin 50 bearsagainst the pin 43 of the driven disc 41. The direction of driving isclockwise viewed from the bottom of Fig. 6. be seen by inspection ofFig. 6 that with two loose discs between the driver and the drivenmember almost three revolutions 'of the driven member can be obtainedand yet permit the driving member to reverse its rotation and come backto zero or the starting point. In this particular case there are fivepins; now assume each pin has a diameter equivalent to 20 degrees on itsdisc 5 20=100 degrees of effective rotative motion is therefore lost asthis is necessary in order to reverse and permit the first pin 35 toassume its starting position. The maximum rotation in degrees for thecombination as shown in Fig. 6 and yet permit the driver to return tozero will then be three revolutions minus 100 or In other words thedriven member can be driven two and one half revolutions and yet permitthe driver to be returned to zero. The driver is initially the metermotor shaft I and the driven member is finally the kilowatt demand dialpointers 23, 24 and 25. These pointers with their respective dials readin tenths, units, and tens reading from right to left. It can readily beseen then from the aforegoing and from the drawings that with two loosediscs as shown in Fig. 6, at least two and one half revolutions of theunits hand 24 or 25 kilowatts demand can be registered in a practicalmanner. The maximum number of degrees thru which the driven member canbe driven can be represented by the following formula: D=(S+1)360-(P)(d) In which,

D=Maximum number of degrees for the driven member.

S=The number of loose discs as shown in Fig. 3 or Fig. 6.

P=The total number of pins in contact.

d=The diameter of each pin in degrees.

The operation of the complete device may be briefly described asfollows: The meter motor shaft revolves in direct proportion to the loadon the meter, its worm 2 drives the worm wheel 3 on shaft 4 revolvingthe worms 1 and8. The worm 1 drives a series of gears driving thekilowatt hour dials in a well known manner. The worm 8 drives worm wheel3 shaft HI and gear It can disc 41 to which is fastened pinion 46,driving the gear wheel 44 thru the spring washer 45. The gear wheel 44meshes with the pinion 5| on shaft 52 and in revolving drives thekilowatt demand dial 23 mounted on the end of this shaft. Mounted onshaft 52 is ratchet wheel 53 to prevent reverse rotation of the shaft52, and also a pinion 54 meshing with a gear wheel 51 on shaft 42. Aspinion 54 revolves it turns the gear 51 and shaft 42 on the end of whichis kilowatt demand dial pointer 24. The shaft 42 also carries a pinion53 which meshes with a gear wheel 60 on shaft SI and on the end of whichis kilowatt demand dial pointer 25. The pinions 54 and 58 have one tenthas many teeth as the gear wheels 51 and 60 so the kilowatt demand dials20, 2| and 22 read respectively in tenths, units and tens from right toleft in Fig. 1.

As the watthour meter shaft revolves, the kilowatt demand dial handswill revolve as just described in proportion to the load on the meter orthe demand for energy, which continues until the end of a predeterminedtime interval of say 30 minutes; at the end of which time interval thelever 36 operated because of rotation of the cam 38" by the timing motorwill open the clutch, pinion l2 and member |5 are separated for a veryshort interval of time by pushing pinion l2 along the sleeve 85 againstthe spring 23. As soon as pinion |2 leaves the face of member l5, memberl5 carrying driving pin 35 is rotated back to its starting point by theweighted sector 31 which meshes with pinion 33. As can be seen thisaction takes place in a short intervalof time and without retardingeffect on the meter motor shaft The ratchet wheel 53 holds the dialpointers at their maximum movement as can be readily seen.

As stated above, when the friction clutch opens, the first time intervalhas come to an end and when it closes again the second time intervalbegins. The driving pin 35 in this case does not drive the pin 48 or thedemand dial hands unil the meter motor shaft I has made as many or morerevolutions than during the first time interval; when it has, the pin 35catches up to pin 48 and starts to drive it, and only in case the numberof revolutions of the meter motor shaft are greater for this 30 minutetime interval. If the demand for electrical energy has been less duringthe second 30 minute time interval than during the first the pin 35 doesnot reach the pin 48 before the clutch is opened and therefore returnsto zero without affecting the demand dial pointers 23, 24 and 25. Ifhowever during any succeeding 30 minute time interval the demand forelectrical energy is greater than during any previous interval thedemand dial hands will becaused to rotate and will show a higher readingevery month. After noting the monthly maximum demand reading generallyin kilowatts demand, the meter reader resets the demand pointer to zerowhich is done by moving the maximum device can be briefly described asfollows: When .Fig. 1.

the meter motor shaft l revolves it drives the pinion it with which ismeshed a sector it of a gear mounted on shaft to, and also on whichshaft is mounted the mumdemand indicator 68, which indicator'moves tothe right, Fig. 7, as the pinion dd revolves and remains at its mumposition for the highest minute interval demand during the month. Toreset. the maximum demand device to zero the maximum demand indicatorSt; is moved to the left until it strikes against its zero stop it; indoing so the pinion db and disc iii are revolved in a reverse directionby slipping on spring washer bringing driven pin 38 back to the zeroposition and in a position to begin the aforedescribed operation anewfor the next monthly maximum demand of energy thru the watthour meter.

The mechanism as a whole is a unitary structure capable of beingattachable to and detachable from an ordinary watthour meter. It ismounted on the meter by means of screws thru the holes M. M. It can alsobe made as a separate demand meter.

Referring now to Fig. 8, this figure is generally similar to Fig. 1 inso far as the face is concerned except the plate 26 of Fig. l is madeinto the form of a circular scale I08 and is graduated to read directlyin kilowatts demand on its edge. The maximum demand indicator S8 isextended to form a maximum demand pointer lei which moves in directproportion to the demand over the graduated dial Hi2. its and ltd arezero and maximum stops for the pointer lei. Other reference charactersare similar to those on This structure forms a long scale indicatingmaximum demand register in which the pointer lei is held fixed at thepoint to which it has been driven by the meter motor shaft.

The embodiment of the invention shown in Figs. 8, 9, 10, and 11 is amodified form of maxi- -mum demand register which may be designated asan accumulative maximum demand register. The maximum demand for anyperiod is added to that of the preceding period at the end of the periodwhich addition is effected by returning the indicating pointer to itszero position The total demand in this case remains the same throughoutthe demand period enabling it to be observed or checked at anyconvenient time.

Referring now to Figures 8, 9, 10, and 11, clutch member is driven bythe meter motor shaft l, as is shown in Fig. 2. 35 is a driving pinwhich engages a pin We on gear wheel ibb which gear meshes with a gearld'l rotatably mounted on shaft 69 to which is fastened the pointerlfll. The gear 8% is rotatably mounted on stud 3b, which is the stud 3dof Fig. 2, and carries a ratchet pawl ldd which by means of gravity or aspring engages a ratchet wheel Hid. Ratchet wheel tee and gear wheel libare fastened together and both are rotatably mounted on stud Stud 3tbeing fixed in plate N as in Fig. 2 and as just described carries thegear wheel ltd and gear wheel lit and ratchet wheel its which are heldon stud 80 by means 'of a collar Ill shrunk on stud 30. The ratio of thegears I08 and It! is so chosen that the pointer IOI will indicatedirectly the maximum demand thru the meter on the scale loll. The gearlid meshes with a pinion 5| mounted on shaft 62. Also mounted on shaft52 is a ratchet wheel 53, pinion 5t and index hand 23. The ratchet wheel53 inthis case has its teeth out so that the pawl 55 held by the spring55 prevents rotation of the shaft 52 in the same direction of rotationas that described and shown in Fig. 2. The pinion Ed meshes with a gearwheel bl mounted on shaft 32. Also mounted on shaft. :32 is a pinion Edwhich meshes with a.

gear wheel dd mounted on shaft 68. The three shafts 52, 32 and ti withtheir respective dials 2t, 2t and 22, and dial hands 23, 2d and tb formthe accumulative demand register.

The operation of the device is briefly as follows: Referring to Fig. 2and Figs. 8, 9, iii and 11, the meter motor shaft 6 drives theusual andwell known kilowatt hour gear train and dial pointers id, id, is and itand the clutch member 3% which in turn drives the gear idl on the shaft69 to which is attached the indicating maximum demand pointer lei whichmoves over the scale tilt, which scale is graduated to read directly inkilowatts demand. The clutch member 36 with its driving pin 35 isreturned to zero every 30 minutes or whatever the time interval is aspreviously described for the embodiment of the invention shown in Figs.1 and 2, leaving the maximum demand pointer ldl at whatever position themaximum demand for the chosen interval hap pens to be, during the chosentime per. 3d.

At the end of the chosen time period usually one month the maximumdemand in kilowatts as shown by the pointer so: on the scale ltd isnoted by the meter reader. The pointer idl is then moved to the zeroposition to begin a new demand time period. In returning the pointer ldito zero the gear Edi which is mounted on the shaft 59 on which thepointer is mounted revalves and drives the gear ice with which itmeshes. The gear 986 carries the ratchet pawl are which pawl engages theratchet wheel M9 to which is fastened the gear wheel lid. As the gearwheel lid meshes with pinion 55 on the shaft 52 the shaft 52 revolvesdriving pinion 5% gear wheel bl, on shaft'dfi, pinion 58 and gear wheellid on shaft ti. the pointers 23, 2 2 and 25 move around on theirrespective dials 2t, 2i and 22 totalizing or adding the last maximumdemand to that which was indicated thereon before the operationoccurred. The ratchet wheel 53, mounted on shaft 52, with its pawl 55and pawl spring 5% prevent reverse rotation and hold the total demand asindicated by the dials 2t, 2t and 22 with their respective pointers 23,2d and 25.

The mechanism for driving the kilowatt hour dials shown at the top ofFig. 8 has not been shown as it is well known.

It can readily be seen from the above description and from the drawingsthat this invention provides means for easily converting an integratingdemand register, that is one in which the demand is driven up by themeter motor as in Figs. 1 and 2 and totaiized on the dials of Fig. 1 toan accumulative demand register, that is one in which the demand istotalized on a set of dials as in Figs. 8 and 9, when the indicatingdemand pointer is returned to zero at the end of the chosen time period.All that is necessary to make As this operation occurs.

the change from one to the other is to change the driving gears ormechanism which is removably mounted on stud 30.

What I claim is:

1. In a maximum demand meter the combination with an electric metermotor shaft, of a relatively stationary arbor, a clutch comprisingengageable and disengageable members, at least one of said members beingrotatably mounted on said arbor, driving connections between said clutchand said shaft, time controlled means for controlling the engagement ofthe clutch members, resettable maximum demand operating means connectedin driving relation to said clutch, means for moving the last mentionedmeans to an initial position, and a maximum demand member adapted to bedriven by said resettable maximum demand operating means in onedirection only.

2. In a maximum demand meter the combination with an electric metermotor shaft, of a relatively stationary arbor, a clutch member rotatablyand slidably mounted on said arbor, driving connections between saidclutch member and said shaft, a second clutch member rotatably mountedon said arbor and cooperating with the first'mentioned clutch member,time controlled means for controlling the engagement of said clutchmembers, resettable maximum demand operating means connected in drivingrelation to said clutch, means for moving the last mentioned means to aninitial position, a maximum demand member adapted to be driven by saidresettable maximum demand operating means in one direction only, andmeans for integrating the maximum demands as indicated by said maximumdemand member.

3. In a maximum demand meter the combination with an electric metermotor shaft, of a relatively stationary arbor, a clutch comprisingengageable and disengageable members, at least one of said members beingrotatably mounted on said arbor, driving connections between said clutchand said shaft, time controlled means for controlling the engagement ofthe clutch members, resettable' maximum demand operating means connectedin driving relation to said clutch, means for moving the last mentionedmeans to an initial position, a maximum demand member adapted to bedriven by said resettable maximum demand operating means in onedirection only, and means for integrating the maximum demands asindicated by said maximum demand member.

4. In a maximum demand meter the combina tion with an electric metermotor shaft, of a maximum demand member, means for operating saidmaximum demand member, driving means between said operating means andsaid shaft, driving connections between said member and said operatingmeans including driving and driven members, and a member having alimited degree of free rotation and adapted to establish drivingconnections between the last two mentioned members.

5. In a maximum demand meter the combination with an electric metermotor shaft, of a maximum demand member, means for operating said maxmum demand member, driving means between said operating means and saidshaft, driving connections between said member and said operating meansincluding rotatable driving and driven members, a member freelyrotatable to a limited extent between said driving and driven members,said driving and driven members having projections out of registry witheach other whereby they may rotate independently and said freelyrotatable member having a projection adapted to form driving connectionsbetween the projections of said driving and driven mem bers.

6. In a maximum demand meter the combination with an electric metermotor shaft, of a maximum demand member, means for operating saidmaximum demand member, driving means between said operating means andsaid shaft, driving connections between said member and said operatingmeans including rotatable driving and driven members, members freelyrotatable to a limited extent between said driving and driven members,said driving and driven members having projections out of registry witheach other whereby they may rotate independently and saidv freelyrotatable members having projections adapted to form driving connectionsbetween the projections of said driving and driven members.

7. In a maximum demand meter the combination with an electric metermotor shaft, of a. max- S. In a maximum demand meter, the combinadrivingmeans including a lost motion connection having at least one memberfreely rotatable to a limited extent between said maximum demand memberand said operating means, and registering means disposed to cooperatewith said maximum demand member for integrating the maximum demands.

9. In a maximum demand meter, the combination with an electric metermotor shaft, of a maximum demand member disposed to be re stored to aninitial position, operating means for said maximum demand member drivenby said shaft, driving means including a lost motion connection havingat least one member freely rotatable to a limited extent between saidmaximum demand member and said operating means, registering means havingdriving connection with said maximum demand member while it is movingfrom said initial position during movement to successively advancedpositions for integrating the maximum demands, and ratchet meanspreventing reverse operation of said registering means.

10. In a maximum demand meter, the combination with an electric metermotor shaft, of a maximum demand member disposed to be restored to aninitial position, operating means for said maximum demand member drivenby said shaft, driving means including a lost motion connection havingat least one member freely rotatable to a limited extent between saidmaximum demand member and said operating means, registering means havingdriving connection with said maximum demand member only while it isbeing restored to said initial position for integrating the maximumdemands, and ratchet means preventing reverse operation of saidregistering means.

BET O. HAMILL.

